Rotary device for rapid grading of patterns



ROTARY DEVICE FOR RAPID GRADING OF PATTERNS Filed Oct. 19, 1953 INVENTOR. DIXON INGRAM United States Patent ROTARY DEVICE FOR RAPID GRADING OF PATTERNS Dixon Ingram, Brooklyn, N. Y., assignor to Sunny Young, Inc., New York, N. Y.

Application October 19, 1953, Serial No. 386,897

1 Claim. (Cl. 33-42) This invention relates to tracing and enlarging devices for patterns or the like.

More particularly, the present invention proposes the construction of an improved rotary device for tracing and enlarging patterns, templates and the like with a pencil, stylus or other marking instrument.

Another object of the present invention proposes forming a rotary device which can be made in various sizes so that patterns can be enlarged to larger sizes merely by tracing around them With a pencil or other marker held in the rotary device for the particular size desired, for example so that a size dress pattern can be enlarged, to a size 12, 14, 16, 18, etc.

Still further, the present invention proposes forming the rotary device with an axial opening to pass a pencil or marking device and providing a ball bearing means in the opening to reduce friction and permit the device to freely rotate about the marking device.

As a further object, the present invention proposes constructing each of the rotary devices with an annular guide flange to guide the edge of a pattern into a groove so that it may be seated therein.

The present invention further proposes a novel arrangement of the rotary device so that the device will be simple andinexpensive to make and so that different size .patterns can be obtained merely by increasing the radius from the longitudinal axis to the peripheral pattern edge bearing portion.

For further comprehension of the invention, and of the objects and advantages hereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a pencil in the rotary tracing and enlarging device of the present invention, fragments of a pattern, material on which a pattern is being traced, and a table being shown to illustrate the operation of the device.

Fig. 2 is a sectional view taken on line 2-2 of Fig. l, the top end of the pencil being broken away.

Fig. 3 is a sectional view similar to Fig. 2 but illustrating the structure for obtaining a smaller size enlargement of a pattern.

Fig. 4 is a view similar to Fig. 3 but illustrating a modification of the present invention, a pencil being shown in dot-dash outline in the device.

Referring to the first form of the invention illustrated in Figs. 1, 2 and 3, the rotary device shown in Figs. 1 and 2 has a body preferably made of metal but which can be molded of plastic or other material.

Body 15 has an axial opening 16 the upper part of which is enlarged into a chamber 17 and the lower part of which has conically tapering polished side Walls 18 which terminate in a narrow exit 19. The side walls 18 are of the shape of the sharpened portion 20 of pencil 21 and the exit 19 is adapted freely to pass the point 22 2,782,506 Patented Feb. 26, 1957 of the pencil 21 while its sharpened portion 20 is resting on the side walls 18.

In the upper part of chamber 17, a plurality of ball bearings 23 rotatably held in race rings 24 and 25 are mounted. The pencil 21 fits through the opening 25' in the inner race ring 25 and by this means friction is reduced so that the body 15 can freely rotate about the pencil. The outer race ring 24 fits tightly in the chamber 17. The rings and bearings are spaced far enough above the tapered side walls 18 of the axial opening 16 and fit closely enough to the pencil 21 so that there is no appreciable lateral relative movement between the pencil and the body oncethe pencil is therein.

Body 15 is cylindrical in shape and has a flat bottom surface 26. Body 15 also has a relatively narrow annular peripheral flange 27 bordering on the bottom surface 26. A cylindrical pattern following portion 28 is provided on the body 15 above and adjacent to the flange 27. This portion 28 is in the form of an annular groove with a base surface 29 at the bottom of the groove which is uniformly spaced from the longitudinal axis of the body 15 a predetermined distance d, such as or /z" for example.

The groove portion 28 is of a size to receive the edge 30 of a pattern 31 so that the edge abuts its base surface 29. The base surface 29 is of a nature so as to frictionally contact or bear against the pattern edge 30 for rotation of the body 15 about the instrument as the body is moved along the pattern edge 30 by the pencil 21. The distance d, is such as to space the pencil point 22 the correct distance away from the pattern edge to scribe a predetermined enlargement of the pattern 31 of the material 32 resting on table 33 which material 32 may either be pattern material or the material from which a garment is to be cut. The top edge 33' of the flange 27 is inclined and this inclined surface between the flange and the groove base surface 29 provides a guide to mOve the edge 30 of pattern 31 against the surface 29.

By varying the distance d, different size enlargements can be made. Fig. 3 illustrates how a body 15 similarly formed to body 15 shown in Figs. 1 and 2 and illustrated above (and hence having similar reference numerals but primed to distinguish the two bodies 15 and 15) may be made with its distance d' of a different length, such as for example Vs", A or A. By multiplying such bodies, devices for enlargements of any size can be obtained, the annular peripheral portions 28 and 28' each being of a different diameter corresponding to a prede termined enlargement size.

The modification of the present invention illustrated in Fig. 4 is characterized by the provision of a body 35 having an axial opening 36 of a diameter larger than the cross sectional width of a pencil 37, indicated in dot dash outlines, so as to permit the body 35 to rotate around the pencil 37. The point 38 of the pencil extends through the body 35 and may bear against any surface thereunder.

Body 35 is cylindrical with a fiat bottom surface 39, a peripheral groove 40 spaced above the bottom surface 39 with a peripheral surface 41 therebetween and an inclined surface 42 connecting the peripheral surface or flange with the annular base surface 43 of the groove 40. The groove 40 is adapted to receive the edge of a pattern so the base surface 43 can bear thereagainst for rotation therealong. Base surface 43 is spaced 2. predetermined distance from the longitudinal axis of the body 35.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claim.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent In a pattern tracing device, a sharpened pencil adapted to be drawn across the material to trace a line thereon and being guided in its travel by a pattern, a support for said pencil slidable over the material to be traced and being rotatable about a vertical axis, said support including a solid cylindrical body with a chamber in its upper portion, said chamber being circular in cross-section, said solid body having a central tapered opening through its bottom portion communicating with said chamber for receiving the tapered portion of the sharpened pencil, said tapered opening terminating in a restricted straight portion to receive the lead point of the sharpened pencil, a ball bearing assembly plugging the upper end of said chamber, said assembly having a central opening to receive the body of the pencil, said cylindrical body having an annular groove in the outer surface thereof, said groove in cross-section being similar in shape to the edge of the guiding pattern in order to receive said edge frictionally, the entrance edges to said groove being tapered to facilitate movement of the pattern edge into the groove.

References Cited in the file of this patent UNITED STATES PATENTS 978,486 Reed Decv 13, 1910 1,304,501 Menin et al May 20, 1919 1,668,085 Orzel May 1, 1928 1,807,619 Boush June 2, 1931 1,878,633 Hoferer Sept. 20, 1932 2,314,327 Drake Mar. 23, 1943 2,321,949 Sorensen June 15, 1943 2,514,003 Martin July 4, 1950 OTHER REFERENCES An article entitled Drafting Aids on page 98 of Popular Science, September 1945. 

